diff --git a/journal/migrations/0021_pieceinteraction_pieceinteraction_unique_interaction.py b/journal/migrations/0021_pieceinteraction_pieceinteraction_unique_interaction.py
new file mode 100644
index 00000000..360afac5
--- /dev/null
+++ b/journal/migrations/0021_pieceinteraction_pieceinteraction_unique_interaction.py
@@ -0,0 +1,70 @@
+# Generated by Django 4.2.8 on 2023-12-27 20:09
+
+import django.db.models.deletion
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("users", "0017_mastodon_site_username_bd2db5_idx"),
+        ("journal", "0020_shelflogentry_unique_shelf_log_entry"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PieceInteraction",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("target_type", models.CharField(max_length=50)),
+                ("interaction_type", models.CharField(max_length=50)),
+                (
+                    "created_time",
+                    models.DateTimeField(default=django.utils.timezone.now),
+                ),
+                (
+                    "identity",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="interactions",
+                        to="users.apidentity",
+                    ),
+                ),
+                (
+                    "target",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="interactions",
+                        to="journal.piece",
+                    ),
+                ),
+            ],
+            options={
+                "indexes": [
+                    models.Index(
+                        fields=["identity", "interaction_type", "created_time"],
+                        name="journal_pie_identit_bd12d3_idx",
+                    ),
+                    models.Index(
+                        fields=["target", "interaction_type", "created_time"],
+                        name="journal_pie_target__f943ca_idx",
+                    ),
+                ],
+            },
+        ),
+        migrations.AddConstraint(
+            model_name="pieceinteraction",
+            constraint=models.UniqueConstraint(
+                fields=("identity", "interaction_type", "target"),
+                name="unique_interaction",
+            ),
+        ),
+    ]